Hydroponic trough



FIG. 1 is a perspective view of a hydroponic trough showing our new design, shown broken-away to indicate indeterminate length;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is an end elevational view thereof, the opposite end being identical in appearance. 

The ornamental design for a hydroponic trough, as shown and described. 